PSU made with power op-amp and small trafo

[carlosfm]

Guys, I've been thinking...
Correct me if I'm wrong (I love to say this ) on my thoughts.

What I have in mind is from a small and cheap transformer (say, 2x24v/1A) make a good PSU for a GC.

The transformer would at the same time supply the power op-amp and the non-iniverting input.
That is, V+ connected to +IN on one power op-amp.
The other one would have the V- connected to +IN.
On the output of one op-amp you would have + voltage, and on the other one you would have the negative.
The voltage would be the same, because an op-amp won't swing more voltage than it has on the PSU supplying it, no matter what gain you configure it.
I was thinking in OPA541, for instance.
It's unity-gain stable.

My doubt, and the question here, is if I would have more current on the output than the current the transformer has (1A).
Wouldn't it be nice to have a 10A PSU (with OPA541) with a 1A transformer?

Am I dreaming?

[tiroth]

Am I dreaming?

Yup. Nothing is free. Rail sag will limit your current. Of course due to losses it will be even more limited than a passive supply.

You are essentially using the opamp as a regulator.

[carlosfm]

Thanks for awaking me from a nice dream.